If you love Disney history and Walt Disney himself and do not love
Disneyland, you're doing it wrong. I recommend the Walk in Walt's Footsteps Tour. Even though you may already know a lot of the facts they share, you may also learn something new, even if it's a fun little thing. There's a charm and intimacy in Disneyland that Walt Disney World does not have. I will forego other thoughts in the interests of time and leaving you to discover Disneyland for yourself. I will say this. The Magic Kingdom calls itself the Magic Kingdom. Disneyland has a very important variation on that name.
Walt Disney's Magic Kingdom (emphasis added). If you have the time, I strongly recommend heading up to San Francisco (6-7 hours north) and spending a day (and I mean give yourself 6-8 hours) at the Walt Disney Family Museum in the Presidio by the Golden Gate Bridge.
ATTQOTD Celebrations: If the trip is for a specific celebration no matter how early or late it may be, the buttons are fine if you want to do them. As others have mentioned, you may get a little bit of pixie dust. Once at the Italy Restaurant in Epcot before it was Tutto Italia, the accordion player serenaded my parents with Bella Notte from Lady and the Tramp when we told the staff it was my parents anniversary.
And on a recent visit to Disneyland, my brother in law was celebrating his college graduation many years after leaving college to provide for his family and do all of this while working full time. I noticed how much his wearing that button meant to a security guard working on his own college degree. I believe it told this good man that he too would make it. So celebrate. And enjoy it.
In what I hope will become a tradition, I spent a good chunk of the morning last 4th of July watching Sam Eagle Muppets videos where he attempted to celebrate America in his uniquely serious way before general Muppet mayhem ensued. Yes, this includes both Muppets Great Moments in American History from Walt Disney World.